Development of an on-line SPR-digestion-nanoLC-MS/MS system for the quantification and identification of interferon-gamma in plasma.
Biosens Bioelectron
; 24(7): 2184-90, 2009 Mar 15.
Article
en En
| MEDLINE
| ID: mdl-19157843
ABSTRACT
An automated, on-line system for protein quantification and identification, employing Surface Plasmon Resonance (SPR), enzymatic protein digestion, nanoLC and tandem-MS (MS/MS), has been developed. For the experiments recombinant human interferon-gamma (rhIFN-gamma) in buffer or diluted bovine plasma was used as a model protein. Upon injecting 90muL of a 1mugmL(-1) solution of rhIFN-gamma in diluted plasma at a flow rate of 10muLmin(-1), 320fmol of protein was reproducibly bound to the sensor surface. After desorption of the isolated protein from the SPR surface using 10mM glycine pH 1.3, on-line digestion, nanoLC and MS/MS analysis, rhIFN-gamma could be identified on basis of peptide masses and MS/MS fragmentation data. A sequence recovery of 66% was found when a pepsin micro reactor was used. For a trypsin micro reactor the sequence recovery was 50%. In the latter case, the desorbed protein solution was pH-tuned with a TRIS buffer for optimal enzyme activity. With the identified trypsin- and pepsin-produced peptides and because parts of their amino acid sequences overlap, the protein sequence can be largely elucidated showing the potential for the analysis of unknown proteins. The SPR-digestion-nanoLC-MS/MS platform provides unattended analysis of a sample within 60min.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Espectrometría de Masas
/
Análisis Químico de la Sangre
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Cromatografía Líquida de Alta Presión
/
Interferón gamma
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Análisis de Inyección de Flujo
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Resonancia por Plasmón de Superficie
/
Nanotecnología
Tipo de estudio:
Diagnostic_studies
/
Evaluation_studies
/
Prognostic_studies
Límite:
Humans
Idioma:
En
Revista:
Biosens Bioelectron
Asunto de la revista:
BIOTECNOLOGIA
Año:
2009
Tipo del documento:
Article
País de afiliación:
Países Bajos